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Unknown node type WebSockSrc

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{
  "_path": "tag:das2.org,2012:site:/uiowa/tracers/tracers-2/l1a/msc/merged/flexRT",
  "_url": "https://space.physics.uiowa.edu/das/stream/source/tracers/tracers-2/l1a/msc/merged/flexRT.json",
  "contacts": [
    {
      "email": "chris-piker@uiowa.edu",
      "name": "Chris Piker",
      "type": "maintainer"
    },
    {
      "name": "George Hospodarsky",
      "type": "scientific"
    }
  ],
  "interface": {
    "coords": {
      "time": {
        "label": "Time",
        "props": {
          "max": {
            "label": "Maximum",
            "set": {
              "param": "read.time.max",
              "required": true
            },
            "title": "Maximum time value to stream",
            "value": null
          },
          "min": {
            "label": "Minimum",
            "set": {
              "param": "read.time.min",
              "required": true
            },
            "title": "Minimum time value to stream",
            "value": null
          },
          "units": {
            "value": "UTC"
          }
        },
        "validRange": [
          "2025-08-04T22:56",
          "2025-08-31T23:40"
        ]
      }
    },
    "examples": [
      {
        "label": "Most Recent 10 minutes",
        "settings": {
          "coords/time/props/max": "2025-08-31T23:40",
          "coords/time/props/min": "2025-08-31T23:28"
        }
      }
    ],
    "formats": {
      "das": {
        "label": "das stream",
        "mimeTypes": [
          "application/vnd.das.stream"
        ],
        "props": {
          "enabled": {
            "type": "boolean",
            "value": true
          },
          "version": {
            "label": "Stream Version",
            "value": "das3"
          }
        },
        "title": "Streaming format for plots"
      }
    },
    "options": {
      "label": "Options",
      "props": {
        "filter": {
          "label": "AppID Filter",
          "set": {
            "enum": [
              {
                "title": "AC Mag 3-Vectors at 2048 Hz",
                "value": "x242"
              },
              {
                "title": "AC Mag 3-Vectors at 2048 Hz",
                "value": "x252"
              }
            ],
            "param": "read.apid"
          },
          "title": "Filter output data by CCSDS AppID",
          "type": "enum",
          "value": null
        }
      },
      "title": "Optional properties for this data source"
    }
  },
  "label": "Merged",
  "name": "MSC_fm2_merged",
  "protocol": {
    "authorization": {
      "required": false
    },
    "baseUrls": [
      "wss://space.physics.uiowa.edu/das/rtstream/tracers/tracers-2/l1a/msc/merged/flexRT"
    ],
    "convention": "HTTP/1.1",
    "httpParams": {
      "read.apid": {
        "enum": [
          "x242",
          "x252"
        ],
        "required": false,
        "type": "enum"
      },
      "read.time.max": {
        "required": true,
        "type": "isotime"
      },
      "read.time.min": {
        "required": true,
        "type": "isotime"
      }
    },
    "method": "GET",
    "subprotocols": [
      "request"
    ]
  },
  "title": "TRACERS-2 MSC: Merged Level 1A",
  "type": "WebSockSrc",
  "version": "0.1"
}